unbound: add cache-max-negative-ttl

Jan Pavlinecrequested to merge
hotfix/unbound-max-neg-ttl into master

This PR fixes #748 (closed)

Default value changed from 15s to 16min (unbound default is 1h)

Note It should be first reported to upstream before merging It also requires creating fix-pkglists package

Edited by Jan Pavlinec

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